This is a tough question to answer, as it depends on several factors, such as the age and condition of the vehicle, the type of maintenance it requires, and the cost of parts and labor in your area. Generally speaking, Hummers are not considered to be the most affordable vehicles to maintain. However, their parts and labor costs tend to be slightly lower than other SUVs of the same size and age. Additionally, there are many online resources that provide helpful information about maintaining Hummers and other vehicles.